Here's why:
* Adaptive features: Angiosperms have evolved a variety of adaptations that help them thrive in arid environments, including:
* Succulence: Many desert angiosperms store water in their leaves, stems, or roots (e.g., cacti, agaves, euphorbs).
* Deep root systems: Some plants have extensive root systems that tap into deep water sources.
* Reduced leaf surface area: Many desert plants have small, thick leaves or spines to minimize water loss through transpiration.
* CAM photosynthesis: This specialized type of photosynthesis allows plants to open their stomata (pores) at night to absorb CO2 and minimize water loss during the day.
* Diversity: Angiosperms are the most diverse plant group on Earth, offering a wide range of species with various adaptations for different desert conditions.
Examples of desert angiosperms:
* Cacti: Various species like saguaro, prickly pear, and cholla.
* Agaves: Known for their succulent leaves and dramatic flower stalks.
* Joshua trees: Iconic desert trees with distinctive branches.
* Mesquite: A drought-tolerant legume with a deep root system.
* Ocotillo: A spiny shrub with distinctive long stems.
Therefore, while other divisions might have some desert-adapted species, angiosperms are the most prominent and diverse group of plants thriving in deserts.
